JPS5234608A - Multifrequency signal receiving system - Google Patents

Multifrequency signal receiving system

Info

Publication number
JPS5234608A
JPS5234608A JP50094573A JP9457375A JPS5234608A JP S5234608 A JPS5234608 A JP S5234608A JP 50094573 A JP50094573 A JP 50094573A JP 9457375 A JP9457375 A JP 9457375A JP S5234608 A JPS5234608 A JP S5234608A
Authority
JP
Japan
Prior art keywords
signal receiving
receiving system
multifrequency signal
multifrequency
different
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP50094573A
Other languages
English (en)
Other versions
JPS569075B2 (ja
Inventor
Koichi Hasegawa
Atsushi Iwata
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEC Corp
Nippon Telegraph and Telephone Corp
Original Assignee
NEC Corp
Nippon Telegraph and Telephone Corp
Nippon Electric Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by NEC Corp, Nippon Telegraph and Telephone Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP50094573A priority Critical patent/JPS5234608A/ja
Publication of JPS5234608A publication Critical patent/JPS5234608A/ja
Publication of JPS569075B2 publication Critical patent/JPS569075B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q1/00—Details of selecting apparatus or arrangements
    • H04Q1/18—Electrical details
    • H04Q1/30—Signalling arrangements; Manipulation of signalling currents
    • H04Q1/44—Signalling arrangements; Manipulation of signalling currents using alternate current
    • H04Q1/444—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies
    • H04Q1/45—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling
    • H04Q1/453—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling in which m-out-of-n signalling frequencies are transmitted

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
JP50094573A 1975-08-01 1975-08-01 Multifrequency signal receiving system Granted JPS5234608A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP50094573A JPS5234608A (en) 1975-08-01 1975-08-01 Multifrequency signal receiving system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP50094573A JPS5234608A (en) 1975-08-01 1975-08-01 Multifrequency signal receiving system

Publications (2)

Publication Number Publication Date
JPS5234608A true JPS5234608A (en) 1977-03-16
JPS569075B2 JPS569075B2 (ja) 1981-02-27

Family

ID=14114032

Family Applications (1)

Application Number Title Priority Date Filing Date
JP50094573A Granted JPS5234608A (en) 1975-08-01 1975-08-01 Multifrequency signal receiving system

Country Status (1)

Country Link
JP (1) JPS5234608A (ja)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS546404A (en) * 1977-06-17 1979-01-18 Nippon Telegr & Teleph Corp <Ntt> Multi-frequency signal mixer with control circuit for signal transmission time-length
JPS5491108A (en) * 1977-12-28 1979-07-19 Fujitsu Ltd Multi-frequency signal detection system

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58162073U (ja) * 1982-04-22 1983-10-28 株式会社精工舎 時計などの文字板取付け構造

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3795775A (en) * 1972-10-16 1974-03-05 Microsystems Int Ltd Dual tone receiver
JPS507883A (ja) * 1973-05-23 1975-01-27
US3875347A (en) * 1973-10-01 1975-04-01 Gte Automatic Electric Lab Inc Multifrequency signal receiver

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3795775A (en) * 1972-10-16 1974-03-05 Microsystems Int Ltd Dual tone receiver
JPS507883A (ja) * 1973-05-23 1975-01-27
US3875347A (en) * 1973-10-01 1975-04-01 Gte Automatic Electric Lab Inc Multifrequency signal receiver

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS546404A (en) * 1977-06-17 1979-01-18 Nippon Telegr & Teleph Corp <Ntt> Multi-frequency signal mixer with control circuit for signal transmission time-length
JPS5491108A (en) * 1977-12-28 1979-07-19 Fujitsu Ltd Multi-frequency signal detection system
JPS5828995B2 (ja) * 1977-12-28 1983-06-20 富士通株式会社 多周波信号検出方式

Also Published As

Publication number Publication date
JPS569075B2 (ja) 1981-02-27

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